The Fujitsu AOU24RLXFW is a 24,000 BTU split-type air conditioning unit with R410A refrigerant, designed for residential and light commercial applications. This service manual covers technical specifications, installation procedures, maintenance guidelines, troubleshooting, and repair instructions for qualified service technicians. Below are key sections for safety precautions, technical data, installation, operation, maintenance, and troubleshooting.
Before servicing, read all safety instructions carefully. Only qualified technicians should perform installation and repair work.
| Warning Type | Precaution |
|---|---|
| Electrical Safety | Disconnect all power sources before servicing |
| Refrigerant Handling | Use proper recovery equipment for R410A |
| High Pressure | System operates at high pressure; use pressure gauges |
| Moving Parts | Keep hands clear of fans and moving components |
| Hot Surfaces | Compressor and pipes may be hot during operation |
| Refrigerant Leaks | Work in well-ventilated areas; no open flames |
Proper installation is critical for optimal performance and safety.
WARNING! Incorrect installation may cause equipment damage, personal injury, or void warranty.
All electrical work must comply with local codes and be performed by licensed electricians.
| Connection | Specification |
|---|---|
| Power Supply | 208/230V, 60Hz, 1Phase |
| Minimum Circuit Ampacity | 15A |
| Maximum Fuse Size | 20A |
| Wire Size | 14 AWG minimum |
| Grounding | Required - use grounding wire |
| Communication Cable | Shielded 2-core cable |
The unit features multiple operation modes and advanced control functions.
Operation Modes: Cooling, Heating (if equipped), Dry, Fan Only, Auto
Control Features: Temperature setting, Fan speed control, Timer functions, Sleep mode, Swing louver control, Filter reset indicator
Remote Control: LCD display, Mode selection, Temperature adjustment, Fan speed, Timer settings, Swing control
Regular maintenance ensures optimal performance and extends equipment life.
CAUTION! Always disconnect power before performing maintenance.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Unit not starting | Power supply issue | Check circuit breaker, power connection |
| Poor cooling/heating | Dirty filters, low refrigerant | Clean filters, check refrigerant charge |
| Water leakage | Clogged drain pipe | Clear drain line, check slope |
| Unusual noise | Loose parts, fan issue | Tighten components, check fan motor |
| Error code displayed | Sensor or board failure | Refer to error code section |
The unit displays error codes for diagnostic purposes.
| Error Code | Description | Solution |
|---|---|---|
| E1 | Room temperature sensor error | Check sensor resistance and wiring |
| E2 | Pipe temperature sensor error | Inspect sensor and connections |
| E3 | Communication error | Check wiring between indoor/outdoor units |
| E4 | Outdoor unit protection | Check outdoor unit components |
| E5 | Overcurrent protection | Verify power supply and compressor |
Common replacement parts for the AOU24RLXFW model.
Refer to detailed wiring diagrams for proper electrical connections.
Main Power Wiring: L1, L2, Ground connections
Control Wiring: Communication between indoor and outdoor units
Sensor Connections: Temperature sensors and their locations
Safety Devices: High/low pressure switches, thermal protectors
NOTE: Always verify wiring against the specific diagram for your unit's serial number.